Network Coding For MIMO Relay Channel

Future mobile communication requires higher transmission speed, better performance and higher system business capacity. In order to meet the above requirements, we introduced network coding technique in the MIMO communication system.Network coding technique is an important breakthrough in network communication and development. The intermediate nodes in network not only focus on simple store-and-forward, but also encode the information that passes by. Therefore, the coding has enlarged the capacity and stability of entire network. In this paper, for the MIMO relay channel and Two-Way relay channel, we separately proposed network precoding scheme and the minimum mean square error (MMSE) based network coding-beamforming combination scheme.For MIMO channel, useing relay to help mobile users to transmit data, achieving the additional diversity gain, improving the BER performance of the receiver, is one of the effective means to improve the quality of connection of mobile users in the edge of cell. Traditional relay scheme (including single-antenna gain and MIMO relay) need to retransmit the data for each source node, so that the transmission efficiency substantial decline with the increase of the network size. In this paper, proposed network precoding scheme achieves network coding and precoding technology to joint design in the relay nodes, not only allows flexible changes in network throughput, but also further improves system performance.For the wireless two-way relay channel (TWRC), where two source nodes exchange information through an assisting relay node. By applying the analogue network coding (ANC), each of source nodes cancels the so-called"self-interference"in the received signal and then decodes the desired message. This paper analyzes the ANC-based beamforming at relay. We present the MMSE based network coding-beamforming combination structure, which reduces the complexity compared with the optimal beamforming programs, and improves system performance compared with sub-optimal beamforming.